<template>
  <!-- 底部 -->
  <div class="my-footer">
    <!-- 全选 -->
    <div class="custom-control custom-checkbox">
      <input type="checkbox" class="custom-control-input" id="footerCheck" v-model="isAll" >
      <label class="custom-control-label" for="footerCheck">全选</label>
    </div>
    <!-- 合计 -->
    <div>
      <span>合计:</span>
      <span class="price">¥ {{ totalPrice }}</span>
    </div>
    <!-- 按钮 -->
    <button type="button" class="footer-btn btn btn-primary">结算 ( {{ countNum }} )</button>
  </div>
</template>

<script>
export default {
  props:{
    goodsList:Array
  },
  data(){
    return {
    
    }
  },
  computed:{
   isAll: {
    get(){
      return this.goodsList.every(item=>item.goods_state)
    },
    set(val) {
      console.log(val);
      this.$emit('changeAll',val)
    }
   },
  //  总金额
   totalPrice(){
    return  this.goodsList.reduce((sum, item)=>{
      // 如果商品处于勾选状态
      if(item.goods_state){
        return sum + (item.goods_price * item.goods_count)
      }
      return sum
      },0).toFixed(2) // 总金额保留2位小数
   },
  //  总件数
  countNum(){
    return this.goodsList.reduce((sum, item)=>{
      // 如果商品处于勾选状态
      if(item.goods_state){
        return sum +item.goods_count
      }
      return sum
      },0)
  }
  }
}
</script>

<style lang="less" scoped>
.my-footer {
  position: fixed;
  z-index: 2;
  bottom: 0;
  width: 100%;
  height: 50px;
  border-top: 1px solid #ccc;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 10px;
  background: #fff;

  .price {
    color: red;
    font-weight: bold;
    font-size: 15px;
  }
  .footer-btn {
    min-width: 80px;
    height: 30px;
    line-height: 30px;
    border-radius: 25px;
    padding: 0;
  }
}
</style>